commit 4037ea75d07b6b17a85c21f2b475e6500de89964
Author: ZGGSONG <zggsong@foxmail.com>
Date:   Tue Feb 21 12:02:28 2023 +0800

    feat: add factory

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f32e31a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.idea/
+.DS_Store
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..14579fe
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+## 说明
+
+《大话设计模式》 代码记录
diff --git a/factory/cash_factory.go b/factory/cash_factory.go
new file mode 100644
index 0000000..5c63fdc
--- /dev/null
+++ b/factory/cash_factory.go
@@ -0,0 +1,15 @@
+package factory
+
+func CreateCashAccept(t int) Casher {
+	var cash Casher
+	switch t {
+	case 1: //正常
+		cash = new(CashNormal)
+	case 2: //8折
+		cash = &CashRebate{moneyRebate: 0.8}
+	case 3: //满300减50
+		cash = &CashReturn{moneyCondition: 300, moneyReturn: 50}
+	default:
+	}
+	return cash
+}
diff --git a/factory/cash_normal.go b/factory/cash_normal.go
new file mode 100644
index 0000000..a207045
--- /dev/null
+++ b/factory/cash_normal.go
@@ -0,0 +1,7 @@
+package factory
+
+type CashNormal struct{}
+
+func (c *CashNormal) AcceptCash(money float64) float64 {
+	return money
+}
diff --git a/factory/cash_rebate.go b/factory/cash_rebate.go
new file mode 100644
index 0000000..12c4431
--- /dev/null
+++ b/factory/cash_rebate.go
@@ -0,0 +1,11 @@
+package factory
+
+// CashRebate
+// @Description: 打折收费
+type CashRebate struct {
+	moneyRebate float64
+}
+
+func (c *CashRebate) AcceptCash(money float64) float64 {
+	return money * c.moneyRebate
+}
diff --git a/factory/cash_return.go b/factory/cash_return.go
new file mode 100644
index 0000000..2fd39c4
--- /dev/null
+++ b/factory/cash_return.go
@@ -0,0 +1,18 @@
+package factory
+
+import "math"
+
+// CashReturn
+// @Description: 返利收费
+type CashReturn struct {
+	moneyCondition float64
+	moneyReturn    float64
+}
+
+func (c *CashReturn) AcceptCash(money float64) float64 {
+	ret := money
+	if money >= c.moneyCondition {
+		ret = money - math.Floor(money/c.moneyCondition)*c.moneyReturn
+	}
+	return ret
+}
diff --git a/factory/cash_test.go b/factory/cash_test.go
new file mode 100644
index 0000000..af87047
--- /dev/null
+++ b/factory/cash_test.go
@@ -0,0 +1,47 @@
+package factory
+
+import "testing"
+
+func TestCashNormal_AcceptCash(t *testing.T) {
+	accept := CreateCashAccept(1)
+	if accept == nil {
+		t.Error("testing failed")
+	}
+	money := 300.0
+	ret := accept.AcceptCash(money)
+	t.Log("\t应付: ", money)
+	t.Log("\t实付: ", ret)
+}
+
+func TestCashRebate_AcceptCash(t *testing.T) {
+	accept := CreateCashAccept(2)
+	if accept == nil {
+		t.Error("testing failed")
+	}
+	money := 300.0
+	ret := accept.AcceptCash(money)
+	t.Log("\t应付: ", money)
+	t.Log("\t实付: ", ret)
+}
+
+func TestCashReturn_AcceptCash(t *testing.T) {
+	accept := CreateCashAccept(3)
+	if accept == nil {
+		t.Error("testing failed")
+	}
+	money := 300.0
+	ret := accept.AcceptCash(money)
+	t.Log("\t应付: ", money)
+	t.Log("\t实付: ", ret)
+}
+
+func TestCash(t *testing.T) {
+	accept := CreateCashAccept(4)
+	if accept == nil {
+		t.Fatal("testing failed")
+	}
+	money := 300.0
+	ret := accept.AcceptCash(money)
+	t.Log("\t应付: ", money)
+	t.Log("\t实付: ", ret)
+}
diff --git a/factory/casher.go b/factory/casher.go
new file mode 100644
index 0000000..0875082
--- /dev/null
+++ b/factory/casher.go
@@ -0,0 +1,5 @@
+package factory
+
+type Casher interface {
+	AcceptCash(money float64) float64
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..9b64f50
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module designpatterns
+
+go 1.19